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[tor-commits] [tor/master] Use autoconf, not gcc version, to decide which warnings we have
commit 9bbd6502f09dd46179e7ca4a713f2ae24bfa79ef
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date: Wed Jun 1 13:38:36 2016 -0400
Use autoconf, not gcc version, to decide which warnings we have
This gives more accurate results under Clang, which can only help us
detect more warnings in more places.
Fixes bug 19216; bugfix on 0.2.0.1-alpha
---
changes/bug19216 | 4 +
configure.ac | 175 ++++++++----------------
src/common/torlog.h | 2 +-
src/common/tortls.c | 4 -
src/ext/ed25519/donna/ed25519-donna-64bit-x86.h | 9 ++
src/or/config.c | 2 +-
src/test/test_bt_cl.c | 4 +-
src/test/test_dir_handle_get.c | 4 +-
src/test/test_helpers.c | 4 +-
src/test/test_microdesc.c | 4 +-
10 files changed, 80 insertions(+), 132 deletions(-)
diff --git a/changes/bug19216 b/changes/bug19216
new file mode 100644
index 0000000..0bca7d1
--- /dev/null
+++ b/changes/bug19216
@@ -0,0 +1,4 @@
+ o Minor bugfixes:
+ - When building with Clang, include our full array of GCC warnings.
+ (Previously, we included only a subset, because of the way we
+ detected them.) Fixes bug 19216; bugfix on 0.2.0.1-alpha.
diff --git a/configure.ac b/configure.ac
index abed17f..f80cb47 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1656,59 +1656,12 @@ esac
# Add some more warnings which we use in development but not in the
# released versions. (Some relevant gcc versions can't handle these.)
+#
+# Note that we have to do this near the end of the autoconf process, or
+# else we may run into problems when these warnings hit on the testing C
+# programs that autoconf wants to build.
if test "x$enable_gcc_warnings_advisory" != "xno"; then
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
-#if !defined(__GNUC__) || (__GNUC__ < 4)
-#error
-#endif])], have_gcc4=yes, have_gcc4=no)
-
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
-#if !defined(__GNUC__) || (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 2)
-#error
-#endif])], have_gcc42=yes, have_gcc42=no)
-
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
-#if !defined(__GNUC__) || (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 3)
-#error
-#endif])], have_gcc43=yes, have_gcc43=no)
-
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
-#if !defined(__GNUC__) || (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
-#error
-#endif])], have_gcc46=yes, have_gcc46=no)
-
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
-#if !defined(__GNUC__) || (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
-#error
-#endif])], have_gcc47=yes, have_gcc47=no)
-
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
-#if !defined(__GNUC__) || (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 8)
-#error
-#endif])], have_gcc48=yes, have_gcc48=no)
-
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
-#if !defined(__GNUC__) || (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 9)
-#error
-#endif])], have_gcc49=yes, have_gcc49=no)
-
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
-#if !defined(__GNUC__) || (__GNUC__ < 5)
-#error
-#endif])], have_gcc5=yes, have_gcc5=no)
-
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
-#if !defined(__GNUC__) || (__GNUC__ < 6)
-#error
-#endif])], have_gcc6=yes, have_gcc6=no)
-
- save_CFLAGS="$CFLAGS"
- CFLAGS="$CFLAGS -Wshorten-64-to-32"
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], have_shorten64_flag=yes,
- have_shorten64_flag=no)
- CFLAGS="$save_CFLAGS"
-
case "$host" in
*-*-openbsd* | *-*-bitrig*)
# Some OpenBSD versions (like 4.8) have -Wsystem-headers by default.
@@ -1718,79 +1671,67 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
CFLAGS="$CFLAGS -Wno-system-headers" ;;
esac
+
CFLAGS="$CFLAGS -W -Wfloat-equal -Wundef -Wpointer-arith"
CFLAGS="$CFLAGS -Wstrict-prototypes -Wmissing-prototypes -Wwrite-strings"
CFLAGS="$CFLAGS -Wredundant-decls -Wchar-subscripts -Wcomment -Wformat=2"
- CFLAGS="$CFLAGS -Wwrite-strings -Wmissing-declarations -Wredundant-decls"
+ CFLAGS="$CFLAGS -Wwrite-strings -Wmissing-declarations"
CFLAGS="$CFLAGS -Wnested-externs -Wbad-function-cast -Wswitch-enum"
CFLAGS="$CFLAGS -Waggregate-return -Wpacked -Wunused"
CFLAGS="$CFLAGS -Wunused-parameter"
- if test "x$have_gcc4" = "xyes"; then
- # These warnings break gcc 3.3.5 and work on gcc 4.0.2
- CFLAGS="$CFLAGS -Winit-self -Wmissing-field-initializers -Wold-style-definition"
- fi
-
- if test "x$have_gcc42" = "xyes"; then
- # These warnings break gcc 4.0.2 and work on gcc 4.2
- # XXXX020 See if any of these work with earlier versions.
- CFLAGS="$CFLAGS -Waddress -Wmissing-noreturn"
- fi
-
- if test "x$have_gcc42" = "xyes" && test "x$have_gcc5" != "xyes"; then
- CFLAGS="$CFLAGS -Wstrict-overflow=1"
- # We used to use -Wstrict-overflow=5, but that breaks us heavily under 4.3.
- # Save it for GCC 5 where they improved the testing.
- fi
-
- if test "x$have_gcc42" = "xyes" && test "x$have_clang" = "xno"; then
- # These warnings break gcc 4.0.2 and clang, but work on gcc 4.2
- CFLAGS="$CFLAGS -Wnormalized=id -Woverride-init"
- fi
-
- if test "x$have_gcc43" = "xyes"; then
- # These warnings break gcc 4.2 and work on gcc 4.3
- # XXXX020 See if any of these work with earlier versions.
- CFLAGS="$CFLAGS -Wextra -Warray-bounds"
- fi
-
- if test "x$have_gcc46" = "xyes"; then
- # This warning was added in gcc 4.3, but it appears to generate
- # spurious warnings in gcc 4.4. I don't know if it works in 4.5.
- CFLAGS="$CFLAGS -Wlogical-op"
- # and these should be just fine in gcc 4.6
- CFLAGS="$CFLAGS -Wmissing-format-attribute -Wsuggest-attribute=noreturn -Wsync-nand -Wtrampolines -Wunused-but-set-parameter -Wunused-but-set-variable -Wvariadic-macros"
- CFLAGS="$CFLAGS -Wdouble-promotion"
- CFLAGS="$CFLAGS -Woverlength-strings"
+ # GCC4.3 users once report trouble with -Wstrict-overflow=5. GCC5 users
+ # have it work better.
+ # CFLAGS="$CFLAGS -Wstrict-overflow=1"
+
+ # This warning was added in gcc 4.3, but it appears to generate
+ # spurious warnings in gcc 4.4. I don't know if it works in 4.5.
+ #CFLAGS="$CFLAGS -Wlogical-op"
+
+ m4_foreach_w([warning_flag], [
+ -Waddress
+ -Warray-bounds
+ -Wc99-c11-compat
+ -Wdate-time
+ -Wdouble-promotion
+ -Wduplicated-cond
+ -Wextra
+ -Wfloat-conversion
+ -Wignored-attributes
+ -Winit-self
+ -Wlogical-op
+ -Wmissing-field-initializers
+ -Wmissing-format-attribute
+ -Wmissing-noreturn
+ -Wnormalized=id
+ -Wnull-dereference
+ -Wold-style-definition
+ -Woverlength-strings
+ -Woverride-init
+ -Wshift-count-negative
+ -Wshift-count-overflow
+ -Wshift-negative-value
+ -Wshift-overflow=2
+ -Wshorten-64-to-32
+ -Wsizeof-array-argument
+ -Wstrict-overflow=2
+ -Wsuggest-attribute=format
+ -Wsuggest-attribute=noreturn
+ -Wswitch-bool
+ -Wsync-nand
+ -Wtrampolines
+ -Wunused-but-set-parameter
+ -Wunused-but-set-variable
+ -Wunused-const-variable=2
+ -Wunused-local-typedefs
+ -Wvariadic-macros
+ ], [ TOR_CHECK_CFLAGS([warning_flag]) ])
+
+ if test "$tor_cv_cflags__Wnull_dereference" = "yes"; then
+ AC_DEFINE([HAVE_CFLAG_WNULL_DEREFERENCE], 1, [True if we have -Wnull-dereference])
fi
-
- if test "x$have_gcc47" = "xyes"; then
- CFLAGS="$CFLAGS -Wunused-local-typedefs"
- fi
-
- if test "x$have_gcc48" = "xyes"; then
- CFLAGS="$CFLAGS -Wsuggest-attribute=format"
- fi
-
- if test "x$have_gcc49" = "xyes"; then
- CFLAGS="$CFLAGS -Wdate-time"
- CFLAGS="$CFLAGS -Wfloat-conversion"
- fi
-
- if test "x$have_gcc5" = "xyes"; then
- CFLAGS="$CFLAGS -Wc99-c11-compat -Wshift-count-negative -Wshift-count-overflow -Wsizeof-array-argument -Wswitch-bool"
- CFLAGS="$CFLAGS -Wstrict-overflow=2"
- fi
-
- if test "x$have_gcc6" = "xyes"; then
- CFLAGS="$CFLAGS -Wignored-attributes -Wshift-negative-value -Wshift-overflow=2"
- CFLAGS="$CFLAGS -Wnull-dereference"
- CFLAGS="$CFLAGS -Wduplicated-cond"
- CFLAGS="$CFLAGS -Wunused-const-variable=2"
- fi
-
- if test "x$have_shorten64_flag" = "xyes"; then
- CFLAGS="$CFLAGS -Wshorten-64-to-32"
+ if test "$tor_cv_cflags__Woverlength_strings" = "yes"; then
+ AC_DEFINE([HAVE_CFLAG_WOVERLENGTH_STRINGS], 1, [True if we have -Woverlength-strings])
fi
if test "x$enable_fatal_warnings" = "xyes"; then
@@ -1799,8 +1740,6 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
CFLAGS="$CFLAGS -Werror"
fi
-##This will break the world on some 64-bit architectures
-# CFLAGS="$CFLAGS -Winline"
fi
if test "$enable_coverage" = "yes" && test "$have_clang" = "no"; then
diff --git a/src/common/torlog.h b/src/common/torlog.h
index 578af7c..80f37e0 100644
--- a/src/common/torlog.h
+++ b/src/common/torlog.h
@@ -176,7 +176,7 @@ void log_fn_ratelim_(struct ratelim_t *ratelim, int severity,
const char *format, ...)
CHECK_PRINTF(5,6);
-#if defined(__GNUC__)
+#if defined(__GNUC__) && __GNUC__ <= 3
/* These are the GCC varidaic macros, so that older versions of GCC don't
* break. */
diff --git a/src/common/tortls.c b/src/common/tortls.c
index fc68418..252da62 100644
--- a/src/common/tortls.c
+++ b/src/common/tortls.c
@@ -26,11 +26,9 @@
#include "compat.h"
-#if GCC_VERSION >= 402
/* Some versions of OpenSSL declare SSL_get_selected_srtp_profile twice in
* srtp.h. Suppress the GCC warning so we can build with -Wredundant-decl. */
DISABLE_GCC_WARNING(redundant-decls)
-#endif
#include <openssl/opensslv.h>
#include "crypto.h"
@@ -48,9 +46,7 @@ DISABLE_GCC_WARNING(redundant-decls)
#include <openssl/bn.h>
#include <openssl/rsa.h>
-#if GCC_VERSION >= 402
ENABLE_GCC_WARNING(redundant-decls)
-#endif
#ifdef USE_BUFFEREVENTS
#include <event2/bufferevent_ssl.h>
diff --git a/src/ext/ed25519/donna/ed25519-donna-64bit-x86.h b/src/ext/ed25519/donna/ed25519-donna-64bit-x86.h
index 30bd472..f6b5570 100644
--- a/src/ext/ed25519/donna/ed25519-donna-64bit-x86.h
+++ b/src/ext/ed25519/donna/ed25519-donna-64bit-x86.h
@@ -2,6 +2,11 @@
#define HAVE_GE25519_SCALARMULT_BASE_CHOOSE_NIELS
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Woverlength-strings"
+#endif
+
DONNA_NOINLINE static void
ge25519_scalarmult_base_choose_niels(ge25519_niels *t, const uint8_t table[256][96], uint32_t pos, signed char b) {
int64_t breg = (int64_t)b;
@@ -347,5 +352,9 @@ ge25519_scalarmult_base_choose_niels(ge25519_niels *t, const uint8_t table[256][
);
}
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
#endif /* defined(ED25519_GCC_64BIT_X86_CHOOSE) */
diff --git a/src/or/config.c b/src/or/config.c
index 13b2269..ca1e17c 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -2683,7 +2683,7 @@ options_validate_cb(void *old_options, void *options, void *default_options,
#define REJECT(arg) \
STMT_BEGIN *msg = tor_strdup(arg); return -1; STMT_END
-#ifdef __GNUC__
+#if defined(__GNUC__) && __GNUC__ <= 3
#define COMPLAIN(args...) \
STMT_BEGIN log_warn(LD_CONFIG, args); STMT_END
#else
diff --git a/src/test/test_bt_cl.c b/src/test/test_bt_cl.c
index ec03ced..95b4f48 100644
--- a/src/test/test_bt_cl.c
+++ b/src/test/test_bt_cl.c
@@ -28,7 +28,7 @@ int a_tangled_web(int x) NOINLINE;
int we_weave(int x) NOINLINE;
static void abort_handler(int s) NORETURN;
-#if GCC_VERSION >= 601
+#ifdef HAVE_CFLAG_WNULL_DEREFERENCE
DISABLE_GCC_WARNING(null-dereference)
#endif
int
@@ -50,7 +50,7 @@ crash(int x)
crashtype *= x;
return crashtype;
}
-#if GCC_VERSION >= 601
+#ifdef HAVE_CFLAG_WNULL_DEREFERENCE
ENABLE_GCC_WARNING(null-dereference)
#endif
diff --git a/src/test/test_dir_handle_get.c b/src/test/test_dir_handle_get.c
index 2df705f..44edaf8 100644
--- a/src/test/test_dir_handle_get.c
+++ b/src/test/test_dir_handle_get.c
@@ -38,13 +38,13 @@
#include <dirent.h>
#endif
-#if GCC_VERSION >= 406
+#ifdef HAVE_CFLAG_WOVERLENGTH_STRINGS
DISABLE_GCC_WARNING(overlength-strings)
/* We allow huge string constants in the unit tests, but not in the code
* at large. */
#endif
#include "vote_descriptors.inc"
-#if GCC_VERSION >= 406
+#ifdef HAVE_CFLAG_WOVERLENGTH_STRINGS
ENABLE_GCC_WARNING(overlength-strings)
#endif
diff --git a/src/test/test_helpers.c b/src/test/test_helpers.c
index bf0365a..ae9fc7a 100644
--- a/src/test/test_helpers.c
+++ b/src/test/test_helpers.c
@@ -16,13 +16,13 @@
#include "test.h"
#include "test_helpers.h"
-#if GCC_VERSION >= 406
+#ifdef HAVE_CFLAG_WOVERLENGTH_STRINGS
DISABLE_GCC_WARNING(overlength-strings)
/* We allow huge string constants in the unit tests, but not in the code
* at large. */
#endif
#include "test_descriptors.inc"
-#if GCC_VERSION >= 406
+#ifdef HAVE_CFLAG_WOVERLENGTH_STRINGS
ENABLE_GCC_WARNING(overlength-strings)
#endif
diff --git a/src/test/test_microdesc.c b/src/test/test_microdesc.c
index 28c4f07..91884e6 100644
--- a/src/test/test_microdesc.c
+++ b/src/test/test_microdesc.c
@@ -490,7 +490,7 @@ test_md_generate(void *arg)
routerinfo_free(ri);
}
-#if GCC_VERSION >= 406
+#ifdef HAVE_CFLAG_WOVERLENGTH_STRINGS
DISABLE_GCC_WARNING(overlength-strings)
/* We allow huge string constants in the unit tests, but not in the code
* at large. */
@@ -650,7 +650,7 @@ static const char MD_PARSE_TEST_DATA[] =
"id rsa1024 2A8wYpHxnkKJ92orocvIQBzeHlE\n"
"p6 allow 80\n"
;
-#if GCC_VERSION >= 406
+#ifdef HAVE_CFLAG_WOVERLENGTH_STRINGS
ENABLE_GCC_WARNING(overlength-strings)
#endif
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